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Photo#24702
Wedge-Shaped Beetle - Macrosiagon sayi - male

Wedge-Shaped Beetle - Macrosiagon sayi - Male
Geneseo, Henry County, Illinois, USA
July 18, 2005
Size: 7mm
I found this beetle today that somewhat resembles a wedge-shaped beetle. Can anyone confirm that for me? Thanks.

Images of this individual: tag all
Wedge-Shaped Beetle - Macrosiagon sayi - male Wedge-Shaped Beetle - Macrosiagon sayi - male

Moved

my bad- Macrosiagon sayi
In retrospect, this is not an odd color variant of M. pectinata but a spot-on example of M. sayi (LeConte 1858).

Sorry!

Yes, Macrosiagon
Yes, a Wedge-shaped beetle of the genus Macrosiagon, I believe.

Neat photos, especially of the antennae.

Patrick Coin
Durham, North Carolina

 
macrosiagon pectinata
Patrick-

You're right, it is a male Macrosiagon, M. pectinata (Fabricius 1775) I believe. The red pronotum is unusual, but not unheard of for this species- it's usually black. Compare the coloration of this critter to the first one posted to the guide. This extreme variation in coloration (and, often, size), has confused taxonomists for centuries, and is common throughout the genus.

cheers,

zack

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